Vol. 27 No. 1

Predicting the behavior of sheet metal in forming process is very important to avoid material failure. The strain limit of sheet metals before tearing occurs is attainable in Forming Limit Diagram (FLD), which can be obtained experimentally or theoretically. Experimentally, FLD of a sheet metal can be achieved by performing ball punch deformation test. Unfortunately, commercially available ball punch deformation test apparatus is still very expensive. In this paper, the design, fabrication and testing process of more affordable ball punch deformation test apparatus is be presented. The ball…

Alga cladophora merupakan salah satu alga yang banyak tumbuh di pesisir pantai Indonesia. Alga cladophora memiliki kandungan selulosa yang cukup tinggi sehingga sangat berpotensi untuk dimanfaatkan sebagai bahan baku material packaging kertas. Tujuan dari penelitian ini adalah mempelajari sifat mekanik kertas yang berbahan dasar selulosa alga cladophora. Pada penelitian ini, selulosa alga cladophora diekstraksi melalui beberapa tahapan proses yang meliputi proses alkalisasi dan proses hidrolisis. Proses alkalisasi dilakukan dengan merefluks alga cladophora didalam larutan NaOH (1%, 5%, 10%,…

Numerical study of experimental setup to evaluate aluminum foam sandwich construction undergoing blast loading is introduced. Aluminum foam sandwich has excellent compression characteristic on absorbing blast impact energy through massive cellular deformation. A case study on an add-on structure of armored vehicle floor is discussed. A finite element prediction using LS-DYNA on the proposed blast experimental setup was constructed to calculate peak force and acceleration. The aims of this preliminary study are to obtain load cell and accelerometer sensors capacity that installed on the setup…

Bioplastik pati merupakan salah satu solusi yang ditawarkan untuk mengatasi permasalahan yang ditimbulkan oleh material plastik konvensional. Namun dikarenakan ketahanan airnya yang buruk, bioplastik pati umumnya digabungkan dengan material yang memiliki ketahanan air yang lebih baik, seperti kitosan. Di dalam pembuatan bioplastik pati-kitosan umumnya melibatkan asam asetat yang dapat membuat bioplastik yang dihasilkan menjadi asam dan kurang baik untuk dimanfaatkan pada beberapa aplikasi. Untuk mengatasi hal tersebut, pada penelitian ini dilakukan pembuatan bioplastik pati-kitosan dengan…

API 5L X65 carbon steel is used in many industries, especially as oil and gas pipelines. However, this carbon steel pipe is vulnerable to corrosion at the inner surface owing to the flow of oil that is a multiphase system and contains dissolved salts. The corrosion phenomenon of the internal surface can be prevented by using an inhibitor. Most of the inhibitors used in industry are composed of compounds that are toxic and environmentally unfriendly. Consequently, the use of a natural inhibitor is at the forefront of corrosion inhibition studies. This study examines the efficiency of…